COMP Cams 1.640 O.D. Spring Shims .635 I.D. .015 Thickness H753C4454 1/8" NPT Port

1/8" NPT Port

Bell SA2010 BR

Small Block Chevy 1986-97

375 and 1968-81 TH350

Chin guard crush: Hammer hits chin guard and measures ability to keep impact away from the head

COMP Cams 1.640 O.D. Spring Shims .635 I.D. .015 Thickness H753C4454 1/8" NPT PortEnsure the equal installed height of all of your valve springs with these 1. 640" outer diameter, . 015" thick, heat treated spring shims. Engine Valve Spring Shim Spring Shim, . 015 X 1. 640The COMP Cams philosophy has never changed: make the highest performing products possible and lead the industry in technological development. One thing COMP Cams has never forgotten: Performance is defined by what happens out on the race track. Because no matter